Shelf



FIG. 1 is a front right perspective view of a shelf showing my newdesign;

FIG. 2 is a front left perspective view thereof;

FIG. 3 is a rear right perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a left side elevation view thereof; and,

FIG. 6 is a front left perspective view of the shelf in use, wherein theshelf has been opened.

CLAIM The ornamental design for a shelf, as shown and described.